--- a/chrome/browser/ui/webui/history/browsing_history_handler.cc
+++ b/chrome/browser/ui/webui/history/browsing_history_handler.cc
@@ -145,7 +145,7 @@ std::pair<std::string, std::string> SetH
     title_to_set.resize(kShortTitleLength);
   }
 
-  return std::make_tuple(entry.url.spec(), base::UTF16ToUTF8(title_to_set));
+  return std::make_pair(entry.url.spec(), base::UTF16ToUTF8(title_to_set));
 }
 
 // Helper function to check if entry is present in local database (local-side
--- a/components/viz/service/display/surface_aggregator.cc
+++ b/components/viz/service/display/surface_aggregator.cc
@@ -2210,7 +2210,7 @@ AggregatedFrame SurfaceAggregator::Aggre
   root_surface_id_ = surface_id;
 
   // Start recording new stats for this aggregation.
-  stats_.emplace();
+  stats_.emplace(AggregateStatistics{});
 
   base::ElapsedTimer prewalk_timer;
   ResolvedFrameData* resolved_frame = GetResolvedFrame(surface_id);
--- a/mojo/public/cpp/bindings/lib/multiplex_router.cc
+++ b/mojo/public/cpp/bindings/lib/multiplex_router.cc
@@ -893,7 +893,7 @@ bool MultiplexRouter::ExclusiveSyncWaitF
   DCHECK(!exclusive_sync_wait_);
 
   scoped_refptr<MultiplexRouter> keep_alive(this);
-  exclusive_sync_wait_.emplace();
+  exclusive_sync_wait_.emplace(ExclusiveSyncWaitInfo{});
   exclusive_sync_wait_->interface_id = interface_id;
   exclusive_sync_wait_->request_id = request_id;
   while (!exclusive_sync_wait_->finished) {
--- a/third_party/blink/common/interest_group/auction_config_mojom_traits.cc
+++ b/third_party/blink/common/interest_group/auction_config_mojom_traits.cc
@@ -227,8 +227,6 @@ bool StructTraits<blink::mojom::AuctionA
       !data.ReadAllBuyersPrioritySignals(&out->all_buyers_priority_signals) ||
       !data.ReadAuctionReportBuyerKeys(&out->auction_report_buyer_keys) ||
       !data.ReadAuctionReportBuyers(&out->auction_report_buyers) ||
-      !data.ReadAuctionReportBuyerDebugModeConfig(
-          &out->auction_report_buyer_debug_mode_config) ||
       !data.ReadRequiredSellerCapabilities(
           &out->required_seller_capabilities) ||
       !data.ReadRequestedSize(&out->requested_size) ||
--- a/third_party/blink/renderer/core/layout/inline/line_breaker.cc
+++ b/third_party/blink/renderer/core/layout/inline/line_breaker.cc
@@ -2728,7 +2728,7 @@ bool LineBreaker::ComputeTrailingCollaps
       if (!trailing_collapsible_space_.has_value() ||
           trailing_collapsible_space_->item_results != results ||
           trailing_collapsible_space_->item_result_index != index) {
-        trailing_collapsible_space_.emplace();
+        trailing_collapsible_space_.emplace(TrailingCollapsibleSpace{});
         trailing_collapsible_space_->item_results = results;
         trailing_collapsible_space_->item_result_index = index;
         if (item_result.EndOffset() - 1 > item_result.StartOffset()) {
--- a/third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h
+++ b/third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h
@@ -604,7 +604,7 @@ class CORE_EXPORT PaintLayerScrollableAr
       mojom::blink::ScrollBehavior scroll_behavior) override {
     if (!should_restore_scroll)
       return;
-    pending_view_state_.emplace();
+    pending_view_state_.emplace(PendingViewState{});
     pending_view_state_->state = view_state;
     pending_view_state_->scroll_behavior = scroll_behavior;
   }
--- a/third_party/webrtc/call/rtp_config.cc
+++ b/third_party/webrtc/call/rtp_config.cc
@@ -258,7 +258,7 @@ RtpStreamConfig RtpConfig::GetStreamConf
   stream_config.raw_payload = raw_payload;
   if (!rtx.ssrcs.empty()) {
     RTC_DCHECK_EQ(ssrcs.size(), rtx.ssrcs.size());
-    auto& stream_config_rtx = stream_config.rtx.emplace();
+    auto& stream_config_rtx = stream_config.rtx.emplace(RtpStreamConfig::Rtx{});
     stream_config_rtx.ssrc = rtx.ssrcs[index];
     stream_config_rtx.payload_type = rtx.payload_type;
   }
--- a/components/compose/core/browser/config.cc
+++ b/components/compose/core/browser/config.cc
@@ -46,11 +46,11 @@
 }
 
 constexpr auto DEFAULT_COMPOSE_ENABLED_COUNTRIES =
-    base::MakeFixedFlatSet<std::string>({"bd", "ca", "gh", "in", "ke", "my",
+    base::MakeFixedFlatSet<std::string_view>({"bd", "ca", "gh", "in", "ke", "my",
                                          "ng", "ph", "pk", "sg", "tz", "ug",
                                          "us", "zm", "zw"});
 constexpr auto DEFAULT_PROACTIVE_NUDGE_ENABLED_COUNTRIES =
-    base::MakeFixedFlatSet<std::string>({"us"});
+    base::MakeFixedFlatSet<std::string_view>({"us"});
 
 }  // namespace
 
--- a/chrome/browser/actor/tools/navigate_tool.cc
+++ b/chrome/browser/actor/tools/navigate_tool.cc
@@ -72,7 +72,7 @@
       return;
     }
 
-    post_navigation_state_.emplace();
+    post_navigation_state_.emplace(PostNavigationState{});
     content::GetUIThreadTaskRunner()->PostDelayedTask(
         FROM_HERE,
         base::BindOnce(&NavigateTool::Timeout, weak_ptr_factory_.GetWeakPtr()),